Pyrogallol Acid


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Pyrogallol was first obtained in 1786 from gallic acid, obtainable from galls and barks of various trees. It is converted to pyrogallol by heating with water under pressure. Pyrogallol is the oldest photographic developer, its rapid deposition of silver from silver salts having first been noted in 1832. 


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25g, 50g, 100g